Derrick



(No Model.)

R. ASHWORTH.

DERRIGK.

No. 461,516. Patented Oct. 20, 1891.

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o UNITED STATES l PATENT OFFICE.

ROBR'I ASl'VORTI-I, OF S'l. CLOUD, MINNESOTA.

SPECIFICATION forming part of Letters Patent No. 461,516, dated October20, 1891. Application tiled April 15, 189].. Serial No. 388,999. (Nomodel.)

To all whom/ it may concern:

Be it known that I, ROBERT AsHwoRrH, a citizen of the United States,residing at St. Oloud, iu .the county of Stearns, State of Minnesota;have invented certain new and useful Improvements in Derricks, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

My invention relates to hoisting-derricks the central post and arm ofwhich are adapted to be swung around, said arm being provided with aweight-carrying truck adapted to travel thereon; and the object of myimprovement is to provide a derrick adapted to be controlled by one man,but capable of lifting and moving a great weight, although of simple andinexpensive construction. I attain these objects by theconstructionillustrated in the accompanying drawings, in which- Figure 1 is a sideview of a derrick constructed in accordance with my invention. Fig. 2 isa top view of the truck thereof on a larger scale.

In said drawings, A indicates the derrickpost, having its lower endpivotally supported upon a foundation or shoe B and its upper endpivot-ally retained in a collar resting on a shoulder formed on the endof the post, said collar having a series of guy wire ropes b2 securedthereto, by-whioh'the derrick-post is retained in a vertical position.From the collar b is suspended by means of bolts b3 a s'econd collar b4to support the upper end of a conical roof having. rafters B4, servingas rigid braces for the part A and extending beyond the swing of theboom to cover and protect from the weather the workmen and materialsunderneath without interfering with the operation of the derrick. To thesides of the derrick-post is secured one end of the boom D. Said boomconsists of two parallel beams retained apart at their outer end, asusual, by a parting-block, so as to leave a channel between them nearlythe whole length thereof, and each one of the parallel beams of the boomhas its outer end supported by a brace D2, the lowerends of said bracesbeing secured to the derrick-post. The outer end of the boom is alsobraced by a wire ropedz, having its inner end secured to a ring d3,clasping the upper portion of the derrick-post.

Upon the top of the two parallel booms constituting the boom of thederrick rails d4 are secured to support and guide the bearingwheels e ofa truck E. Said truck consists of a rectangular frame supported by thefour wheels e, through which pass the axles e2. To cause the truck toadvance toward either end of the boom, there is secured to each end ofthe frame a ring, as e3 e, and to each ring is secured one end of theropef. The end of the rope secured to the ring e4 is extended nearlyhorizontally and is made to pass arou nd a guide-pulley g, locatedbetween the beams of the boom and adjacent to the end thereof. Thence itpasses between said beams and under the truck E to andover the pulleyg2, and thence in a downward direction to a drum G, pivoted in bearingssecured tothe lower portion of the brace D2. The rope f is wrapped a fewturns around said drum and passes therefrom to and around the secondguidepulley g3 back to the eye c3 of the truck, and by rotating the drumvGr by means of handles at the end thereof the ropef, and with it thetruck, is advanced in either direction along the boom.

To elevate a stone or weight, as W, the latter is suspended from a blockH, having two pulleys h, around which passes the lift ing-rope 7c. k2 tothe end of the boom and passes over the pulley Zcmounted centrally onon'eof the axles e2 of the supporting-wheels, and thence downand aroundone of the pulleys lt of the block H, from which it passes over a pulleym, mounted centrally upon the truck E, and down again around the secondpulley hof the block II and over a pulley 7a4, mounted centrally uponthe other axle e2 of the supportingwheels e, and over a pulley n,mounted upon the inner end of the boom, and thence downward t0 a drum p,around which it is' wound a few timesand has its end secured thereto.The drum p has its shaft carried in suitable bearings attached to theside of the post A, and upon one end of said shaft is mounted agear-Wheelp2, with whichis meshing a pinion q, having its shaft inbearings attached to the post or the under side of the braces D2 of thedert-ick, and the shaft of the pinion carries one or more cranks, bywhich it can be ro- Said rope has one end secured at ICO tated, and aratchet-wheel to engage with aV pawl, as usual, to prevent its rotationwhen around the pulley 7c3, and thence around one desired. of thepulleys 7iI and around the pulley m, and

Hav-ing now fully described my inventoml lthence around the secondpulley h and over 15 claimthe pulley 7c", and thence around the pulley 5In combination with a derrick-post and its n, anda drum to Wind the rope7a, substantially boom, having rails and a pulley fn thereon, asdescribed. the truck E, having carrying-Wheels e at each In testimonywhereof I affix my signature in end, pulleys k3 7a4, mounted on theaxles of presence of two Witnesses.

said Wheels and also having a central pulley ROBERT ASHWORTII. 1o m,with a pulley-block H, having two pulleys NVitiiesses:

h on the same axle, a rope 71:, having one end ANDREW C. ROBERTSON,

secured to the end of the boom and passing E. W. MARTIN.

